问题
I am doing a javafx visualisation application for 3d points. As I am new to javafx, I started from the tutorial provided in the oracle website:
http://docs.oracle.com/javase/8/javafx/graphics-tutorial/javafx-3d-graphics.htm#JFXGR256
The example above runs perfect on my Mac, But after adding more points, the mouse drag, which causes the camera to rotate and thus people can view the objects from different angle, became very slow and simply not applicable any more.
I currently have a data for a rabbit with about 40000 points:
The code I used to rotate camera:
cameraXform.ry.setAngle(cameraXform.ry.getAngle() - mouseDeltaX * MOUSE_SPEED * modifier * ROTATION_SPEED);
cameraXform.rx.setAngle(cameraXform.rx.getAngle() + mouseDeltaY * MOUSE_SPEED * modifier * ROTATION_SPEED);
which is the same as in the oracle example.
What I have tried:
- set JVM flag -Djavafx.animation.fullspeed=true, this helped a bit, but not significant.
- set JVM flag -Djavafx.autoproxy.disable=true, this did not help.
- set Cache to true and CacheHint to Cache.SPEED, this did not make much difference.
- create another thread to do the rotation, and sync back after calculation, this did not help neither.
Any help is appreciated.Thanks in advance!
回答1:
Here is how I made a point cloud using tetrahedrons in a triangle mesh. seems to run faster than using spheres or squares. this code helped me scalafx google code
import java.util.ArrayList;
import javafx.scene.shape.TriangleMesh;
public class TetrahedronMesh extends TriangleMesh {
private ArrayList<Point3i> vertices;
private int[] facesLink;
public TetrahedronMesh(double length, ArrayList<Point3i> v) {
this.vertices = v;
if (length > 0.0) {
float[] points = new float[vertices.size() * 12];
int[] faces = new int[vertices.size() * 24];
facesLink = new int[vertices.size() * 4];
float[] texCoords = new float[vertices.size() * 12];
int vertexCounter = 0;
int primitiveCounter = 0;
int pointCounter = 0;
int facesCounter = 0;
int texCounter = 0;
for (Point3i vertex : vertices) {
vertex.scale(100);
points[primitiveCounter] = vertex.x;
points[primitiveCounter + 1] = (float) (vertex.y - (length
* Math.sqrt(3.0) / 3.0));
points[primitiveCounter + 2] = -vertex.z;
points[primitiveCounter + 3] = (float) (vertex.x + (length / 2.0));
points[primitiveCounter + 4] = (float) (vertex.y + (length
* Math.sqrt(3.0) / 6.0));
points[primitiveCounter + 5] = -vertex.z;
points[primitiveCounter + 6] = (float) (vertex.x - (length / 2.0));
points[primitiveCounter + 7] = (float) (vertex.y + (length
* Math.sqrt(3.0) / 6.0));
points[primitiveCounter + 8] = -vertex.z;
points[primitiveCounter + 9] = vertex.x;
points[primitiveCounter + 10] = vertex.y;
points[primitiveCounter + 11] = (float) -(vertex.z - (length * Math
.sqrt(2.0 / 3.0)));
faces[facesCounter] = pointCounter + 0;
faces[facesCounter + 1] = pointCounter + 0;
faces[facesCounter + 2] = pointCounter + 1;
faces[facesCounter + 3] = pointCounter + 1;
faces[facesCounter + 4] = pointCounter + 2;
faces[facesCounter + 5] = pointCounter + 2;
faces[facesCounter + 6] = pointCounter + 1;
faces[facesCounter + 7] = pointCounter + 1;
faces[facesCounter + 8] = pointCounter + 0;
faces[facesCounter + 9] = pointCounter + 0;
faces[facesCounter + 10] = pointCounter + 3;
faces[facesCounter + 11] = pointCounter + 3;
faces[facesCounter + 12] = pointCounter + 2;
faces[facesCounter + 13] = pointCounter + 2;
faces[facesCounter + 14] = pointCounter + 1;
faces[facesCounter + 15] = pointCounter + 1;
faces[facesCounter + 16] = pointCounter + 3;
faces[facesCounter + 17] = pointCounter + 4;
faces[facesCounter + 18] = pointCounter + 0;
faces[facesCounter + 19] = pointCounter + 0;
faces[facesCounter + 20] = pointCounter + 2;
faces[facesCounter + 21] = pointCounter + 2;
faces[facesCounter + 22] = pointCounter + 3;
faces[facesCounter + 23] = pointCounter + 5;
facesLink[pointCounter] = vertexCounter;
facesLink[pointCounter + 1] = vertexCounter;
facesLink[pointCounter + 2] = vertexCounter;
facesLink[pointCounter + 3] = vertexCounter;
texCoords[texCounter] = 0.5f;
texCoords[texCounter + 1] = 1.0f;
texCoords[texCounter + 2] = 0.75f;
texCoords[texCounter + 3] = (float) (1.0 - Math.sqrt(3.0) / 4.0);
texCoords[texCounter + 4] = 0.25f;
texCoords[texCounter + 5] = (float) (1.0 - Math.sqrt(3.0) / 4.0);
texCoords[texCounter + 6] = 1.0f;
texCoords[texCounter + 7] = 1.0f;
texCoords[texCounter + 8] = 0.5f;
texCoords[texCounter + 9] = (float) (1.0 - Math.sqrt(3.0) / 2.0);
texCoords[texCounter + 10] = 0.0f;
texCoords[texCounter + 11] = 1.0f;
vertexCounter++;
primitiveCounter += 12;
pointCounter += 4;
facesCounter += 24;
texCounter += 12;
}
getPoints().setAll(points);
getFaces().setAll(faces);
getTexCoords().setAll(texCoords);
// getFaceSmoothingGroups().setAll(0, 1, 2, 3);
}
}
public Point3i getPointFromFace(int faceId) {
return vertices.get(facesLink[faceId]);
}
}
Point3i code as follows
public class Point3i {
public int x;
public int y;
public int z;
public Point3i() {
x = 0;
y = 0;
z = 0;
}
}
Picking the point using the scene
scene.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent me) {
PickResult pr = me.getPickResult();
int faceId = pr.getIntersectedFace();
if (faceId != -1) {
Point3i p = tetrahedronMesh.getPointFromFace(faceId);
}
}
});
回答2:
I know this is old, But for others ..
Instead of creating a new shape all together, each of the predefined shapes Sphere, Box, Cylinder, allow you to set the number of divisions in the constructor.
Sphere for example defaults to 64 divisions, 32 for longitude, 32 for latitude. you can easily do ... = new Sphere(radius, divisions); (4 is the minimum I believe for Sphere).
来源：https://stackoverflow.com/questions/23749614/how-to-improve-javafx-3d-performance